CHOOSE A PATHWAY:
I was lucky when I started as I knew, without a doubt, that I was a plotter. I don't write a letter without a short list of points I want to cover. But this can be a choice that can help you not get lost in the overwhelming number of things you need to keep in mind for any novel.
I won't go into too much detail as there are hundreds of youtube videos about being a pantser and being a plotter by more experienced people than me. But in one sentence, a pantser is someone who sits down and begins writing 'by the seat of their pants' without an outline or a template of any kind. Steven Kind is a pantser. Being a plotter means that you start with a template, and then an outline, and then begin writing the novel itself.
There are natural-born pantsers like Steven King, and if you are one of those, that should be your pathway. However, my suggestion to a newbie writer, especially if you don't know if you are a pantser or plotter, is to try to at least have a template and at least three-act play structure to keep you on track.
#WRITERS TOOL - MYSTERY TEMPLATE
There are probably hundreds of templates out there for you to choose from. If you search "writing template" at images.google.com, you will find hundreds of them. I incorporated several of them into my own custom Mystery Template. You can click here to download the template to have a look at it or use it.
This is the template I wound up using after at least a year of struggling with the other confusing templates. In time, I began to use a template that was divided into four acts, so to speak, but I'll talk about that one next.